Torsion released die



May 17, 1932. E. T. BYSSHE ET AL 1,358,390

TORSION RELEASED DIE Filed June 26, 1929 5 Sheets-Sheet 1 y 1932- E. T. BYSSHE ET AL TORSION RELEASED DIE:

Filed June 26, 1929 5 Sheets-Sheet 2 y 1931 E. T. BYSSHE ET AL 1,858,390

TORS ION RELEASED DI E Filed June 26, 1929 5 Shets-Sheet 3 /zMf1////f// W flf/ la Z p ,y 4 4/ A a y 17, 1932- E. T. BYSSHE ET AL 1,353,390

TORSION RELEASED DIE Filed June 26, 1929 5 Sheets-Sheet E. T. BYSSHE ET AL.

TORSION RELEASED DIE s Sheet Sheet 5 Filed June 26, 1929 Patented May 17, 1932 UNITED STATES PATENT OFFICE ERNEST T. BYSSHE AND ROBERT R. FINN, OF SPRINGFIELD, VERMONT, ASSIGNORS TO JONES & LAMSON li TACHINE COMPANY,

TION OF VERMONT OF SPRINGFIELD, VERMONT, A CORPORA- TOBSION RELEASED DIE Application filed June 26,

This invention relates to dies for cutting screw threads and has for an object to produce such a die wherein the thread cutting chaser-s are effectively freed from the work when it is desired to stop their cutting action, dies heretofore known having often given considerable trouble in service through failure in this respect. It is quite important, however, that the Chasers be held against opening until the desired cutting action has been completed, it having been found that the centrifugal force developed on rapid indexing of the die from one to an adjoining work spindle or from and to operative relation to a work spindle may be sufficient to release and permit the die to open where the releasing is made relatively easy.

According to this invention, therefore, means are provided to positively lock the die in chaser closed position, this locking means being released by the relative torque between the die and the work when the die is acting so that the chasers may be made to move to open position freely on stopping the advance of a portion of the die relative to the work when the desired length of thread has been cut. Since torque in accordance with this invention is necessary to maintain the die in unlocked condition, the die is securely locked closed when indexing occurs so that such motion cannot act to release or open the die. Torque may also be utilized to effect complete releasing of the chasers for opening.

For a more complete understanding of this invention. reference may be had to the accompanying drawings in which Figure 1 is a side elevation of the die, the chasers being shown in closed position.

Figures 2 and 3 are opposite end elevations thereof.

Figures 4 and 5 are sections on lines 4-4 and 55, respectively. of Figure Figures 6 to 10 inclusive are sections on the correspondingly munbered section lines on Figure 4.

Figures 11 to 18 inclusive are perspectives of various parts of the die.

Figure 19 is a view similar to Figure 9, but show ng the parts in released position.

Figure 20 is a fragmentary view of the rear 1928. Serial No. 373,718.

portion of the die, the cover being removed and the parts being shown as near to opening position.

Figure 21 is a view similar to Figure 20, but showing parts in die-open position.

Referring to the drawings, at 1 is indicated a body, shown detached in Figure 11, comprising a rear relatively small diameter por tion 2 having a threaded extremity 3 and an intermediate larger diameter portion 4 having a threaded extremity 5 and a forward circular head portion 6. The forward face of the head portion 6 is shown as provided with dovetail grooves 7 arranged radially, each of these grooves being designed to receive a mating dovetail portion 8 of a chaser holder 9 shown detached in Figure 12. This chaser holder 9 is shown as provided with a dovetailed groove 10 to receive a dovetail 11 of a chaser 12 such as is shown in Figure 15. While the chaser holders and chasers may be of any suitable type, the holders as shown are particularly designed to receive chasers of the tangent type such as are illustrated in Figure 15, and the holders are movable in their respective dovetail grooves 7 in the head 6 to chaser closed positions wherein the chasers are spaced correctly to cut threads on the work and to open positions in which the chasers are moved outwardly from their closed position.

As shown best in Figure 2 the chasers may be endwise adjustable relative to their holders and for this purpose the holders may be provided with chaser adjusting screws 13, each having a collar portion 14 riding in any selected of a series of grooves 15 extending laterally through the dovetail 11 of the Chasers.

Slidably mounted on the portion 4 of the body is a cam member 20. shown detached in Figure 14., and provided with forwardly and outwardly inclined cam elements 21, each of these elements projecting through an opening 22 through the head 6 of the body portion at the base of a dovetail groove 7, the forward end of each of these elements slidably fitting in an inclined socket 23 in the chaser holder 9 riding in the groove. \Vhen the cam member 20 is moved to its forward limit on the portion 4, these elements 21 extend well into the chaser holders and the chaser holders are held thereby in closed position in operative relation to each other to en; threads on the work. This position of the parts is illustrated in Figure 4:. The cam member 20 is, however, biased to assume a rearward position wherewith the elements 21 moved backwardly relative to the chaser holders so that the chaser hoiders are separated from each other and are in die open position. This may be accomplished by means of springs such as are shown at 25 in Figure 5, each of these springs engaging in oppositely disposed socket portions 26 and 27 in the head 6 and the forward face of the cam member 20. The rear face of the cam member 20 is shown as provided with an annular internally threaded recess 30 into which is threaded for rocking motion relative thereto the forward circular flange 31 of a sleeve 32 shown detached in Figure 13. The sleeve 32 is provided with a series of ribs 33 spaced apart angularly and between these ribs are segmental portions 34 of less length axially than the portions 33 but of greater outside diameter. This sleeve member 32 is also provided with inwardly directed spaced lugs 35 which engage between locking ribs 40 on a locking ring 11, shown detached in Figure 16. and which is loosely mounted on the portion 4 of the body 1 back of the bearing portion on which the cam member 20 is slidably mounted. The portion t is of slightly reduced diameter so that the end face of the ring between the ribs 40 as at 12 may be in sliding engagement with a series of locking lugs 14 extending rearwardly from the cam member 20 and spaced apart to pass between the ribs -10 of the ring 41 when the ring 41 is in the proper angular position with respect thereto. hen the parts are in die closed position the lugs 4-1 are forwardly of the ring 41 and this ring is held locked so that its ribs 40 partly overlap the ends of the lugs 44, as shown by dotted and full lines in Figure 8, so that the chasers are held in their closed positions by a plurality of abuting surfaces spaced angularly about the axis of the die. Springs 135 seated in sockets 136 in the sleeve 32 and reacting against por tions of a holder 50 (to be later described) tend to move to and hold the locking ring in looking angular position.

The rear portion 2 of the body has axially slidable and rotatable thereon the holder 50 having a shank portion 51 designed to be held fixed in a machine spindle (not shown). This holder 50, shown detached in Figure 18, has a plurality of finger portions 511 extending forwardly from an intermediate disk portion 52. These lingers 511 are so spaced that the portions 3-1 of the member 32 he therebetween. Means are provided for preventing the rocking of the sleeve 32 to the position where the locking ring releases the cam memher 20, except after the holder 50 has been moved axially rearwardly relative to the die body, such relative movement being efi'ccted by stopping the forward axial movement of the holder as the chasers are pulled onto the work by their threaded engagement therewith during thread cutting. The means for preventing such rocking, except after the axial movement of the holder, and for preventing initiation of such axial motion, except when the chasers are in operative engagement with work being threaded. comprises a controlling member shown detached in Figure 17. This member (30 is formed as a sleeve provided with means for holding it against rotation relative to the body member, such means as shown comprising a pair of keys (31 positioned in keyways 62 in the member 6t) and extending into slots 63 in the portions n of the body member. This member 60 has outwardly extended. segments 65 which pass between the latch fingers 511. and one edge of each of which, as at 66, rests within a mating notch 67 in one wall of each latch finger 511 when the die is closed and out of operative engagement with work. The engagement of these segments 65 in the notches 67 acts to lock the holder 50 against rear ward motion on the body member until this body member has been first turned relative to the locking member as by torsion due to operative engagement of the chasers on work be ing threaded sufficiently to disengage the segment 66 from the notches 67 against the pres sure of springs 70, each of which has one end seated in a perforation T1 in a. face of the latch finger 511, the opposite end of the spring bearing against a flattened side of a pin 72 projecting from a hole 73 in the rear end face of the segment 65. As soon as the torque exerted by the resistance of the work to the cutting action turns the holder 50 about the axis of the work relative to the body against the pressure of the springs 70. the holder 50 is unlocked so that it may be moved rearwardly relative to the body 1 against th pressure of a series of springs 75. Each of the springs 75 is seated in a socket 76 in the rear end of the shank portion 51 and reacts against the head of a pin 760 which contacts with an abutment collar 77 threaded on the portion 3 of the body and held against turning thereon by any suitable means. as the set screw 78 (see Figure 4) threaded throua'h one of two split portions 79 of the ring 7? and bearing against the other portion 80 thereof. The disk portion 52 of the holder member 5 may be provided with openings 130 therethrough within which the ends of the pins 72 may ride.

When the Chasers are in closed position. therefore, and the holder member 50 which acts to latch the Chasers closed is held against axial movement by the engagement of the controlling member 60 in the notches (3? there 1,aes,seo 3 of, the chasers are held looked in closed operative position. As soon, however, as the chasers are operating on the work, the torque produced by the resistance to cutting turns the holder 50 relative to the body freeing it for axial movement, so that when the threading has been accomplished to the desired extent and the holder 50 is held from further movement axially of the work, continued travel of the chasers on the threaded portion of the work pulls the chasers forwardly thereon against the action of the springs 75, carrying the body member 1 therewith, effecting a rearwardly movement of the holder relative to the body member releasing the chaser or opening movement. The holder 50 is grasped by the usual die carrying means of the machine which is adjusted to permit the desired extent of axial travel thereof, being stopped at one limit of this travel when threading of the work has progressed to the desired axial extent. It will be noted that the forward edge portions 90 of each segment 65 of the member 60 and the mating portions 91 of the fingers 511 have cooperating cam faces such that as the holder 50 is moved rearwardly on the body member sufficiently, as shown in Figure 20, the faces 91 of the fingers may ride down the inclined faces 90 of the locking member, this permitting sufiicient relative torsion between the member 50 and the body member to cause the sleeve to turn and thus turn the locking ring 41 out from position with its segments overlapping the lugs 44 of the cam member, whereupon the springs 26 push the cam member rearwardly and move the chasers to open position. The member 60 is held against rearward 1110- tion relative to the body member by means of a retaining collar 100 threaded ontothe threaded portion 5 of the body and held by any suitable means such as a set screw 101. This collar 100 is preferably provided with peripheral openings 102 for the reception of a suitable spanner wrench to facilitate assembly or removal of this ring while the holder and its retaining abutment collar 77 are removed.

In order that the sleeve 32 may be turned by turning of the holder 50, any desired number of the fingers 511 may be provided with substantially radial openings such as 110 for the reception of plugs 111, the inner ends of which project into suitable recesses 112 in the adjacent latch portions 33 of the member 32. These plugs and sleeves also serve an additional function, as if the cam member 20 should fail to be moved to released position by the springs when the member 50 is in the proper angular position therefor these plugs .111 impinge on the rear end walls 113 of the recesses 112, so that further rearward motion of the holder 50 on the body is transmitted through the pins and the portions 113 to the member 32, and

thus to the cam member to positively move these parts toward die open position. A suitable tubular cover member 115 may be applied outwardly of the fingers 511, this cover member serving to retain the plugs 111 in their respective openings in the latch fingers, and this cover member may be held assembled by suitable spring latch plugs such as are shown at 120 in Figure 6. these latch plugs being seated in sockets 121 in the segmental portions 31 of the member 32 and pressed outwardly by means of springs 122 so that their outer ends 123 of reduced diameter may snap into suitable openings 124 in the cover member 115 when it is in proper position. Split spring retaining rings 125 may be seated within reduced diameter portions 126 of each of the plugs. As soon as the chasers are released from the work, the springs 75 immediately pull the body 2 with the Chasers rearwardly, thus returning the controlling member to a position with its segments in line with the locking notches (i7 and as the release of the rhasers from the work also terminates the torsional effort be u tween the holder 50 and this member, the spring returns the segments 65 into locked position in the notches 67 as shown in Figure 21.

It will be noted that the chusers are held closed by a plurality of engaging abutment faces of the segments 40 of the locking ring and lugs -14 on the cam member. The chasers are thus held accurately when in closed position, being backed up in such a manner that no tilting of the chaser control elements relative to the body is permitted.

The chasers are moved to closed position by moving the cam member 20 forwardly on the body member as by pressure exerted against its rear outer end face outwardly of the cover sleeve 115 sufiiciently to bring its lugs 44 forwardly of the locking ring 10 whereupon the spring 135 turns the sleeve 32 and snaps the locking ring segments back of the lugs 44 to the extent permitted by engagement of the segments 34 against the fingers 511, and after the chasers are moved to closed position they are automatically held locked until the chasers are in operative engagcment with the work, whereupon the die is unlocked by the torsion between the work and the die so that by stopping the axial movement of the holder 50, which acts as a latch member relative to the chasers as they i J.

are pulled onto the work by the threads cut, the movement of the parts to chaser released position is oiiccted by the torsion and if immediate release is not effected by the springs.

the Chasers are positively freed from the ill? skilled in the art that various changes and modifications might be made therein without departing from the spirit or scope of the invention as defined by the appended claims.

\Ve claim:

1. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, means biased to move said chasers to open positions, latching means for holding said chasers against moving to open positions and movable to release said chasers, and means for moving said holding means to chaser released position. said mechanism including cooperating latch parts for preventing movement of said holding means to chaser re leased position until one oi" said parts has been rocked to a predetermined extent about the axis of work operated on by said chasers.

2, A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, means tending to move said chasers to open positions, latching means for holding said chasers against moving to open positions and movable to release said chasers, and means responsive to torque between the chasers and work under predetermined conditions for moving said holding means to chaser released position.

3. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, means tending to move said chasers to open positions. means for holding said chasers against moving to open positions and movable to release said chasers, and an element movable axially of said body and re ponsive to torque between the chasers and the work while in a predetermined axial position to move said holding means to chaser released position.

4. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, means tending to move said chasers to open positions. means for holding said chasers against moving to open positions and movable to release said chasers, an element movable axially of said body and responsive to torque between the chasers and the work while in a predetermined axial position to move said holding means to chaser released position, and means tending to hold said element out of said predetermined position.

5. A. mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, means tending to move said chasers to open positions, means for holding said chasers against moving to open positions and movable to release said chasers, an element movable axiallv of said body and responsive to torque between the chasers and the work while in a predetermined axial position to move said holding means to chaser released position, means tending to hold said element out of said predetermined position and in a different predetermined position, and releasable means for holding said element in said different predetermined position.

6. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, means tending to move said chasers to open positions, means for holding said chasers against moving to open positions and movable to release said chasers, an element movable axially of said body and responsive to torque between the chasers and the work while in a predetermined axial position to move said holding means to chaser released position. means tending to hold said element out of said predetermined position and in a differcnt predetermined position, and means releasable by torque between said chasers and work for holding said element in said different predetermined position.

7. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, means biased to move said chasers to open positions, a member movable axially of said body and operatively connected to said chasers to move said chasers between open and closed positions, resilient means tending to move to and bold said moving member in chaser open position, and means for holding said member in chaser closed position including an element movable to release said member and including means for locking said element against releasing movement yieldable to torque between the die and work away from looking relation.

8. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, means biased to move said chasers to open positions. means including a latch element for holding said chasers in closed position yieldable to torque between said body and the work, and a member with which said element cooperates to require an axial movement of said element to permit said element to yield further to such torque and release said chasers.

9. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, means including a latch element for holding said chasers in closed positions rockable relative to said body to release said chasers and movable axially thereof, and a member cooperloo sting with such latch element for preventing such axial movement until after an initial rocking movement and for necessitating such axial movement to release said chasers.

10. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, a latch element for holding said chasers in closed positions rockable relative to said body to release said chasers and movable axially thereof, a member cooperating with such latch element for preventing such axial movement until after an initial rocking movement and for necessitating such axial movement for snfiicient rocking movement to release said chasers, and connections between said chasers and element for causing axial movement of said element to move said chasers positively toward open positions.

11. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative and open inoperative positions, means including an element movable axially of said body to move said chasers to open position, and means for preventing such movement of said element until after turning of said element about the axis of said body has been eflected.

12. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative and open inoperative positions, a holder for said body mounted for axial and rocking motion thereon, connections between said holder and chasers for holding said chasers in closed positions When positioned therein in one position of said holder relative to said body, means yieldable to torque produced by operation of said chasers on the work tending to hold said holder in the angular relation of said holding position, and means for preventing release of said chasers until said holder is moved axially of said body to a predetermined position.

13. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative and open inoperative positions, a holder for said body mounted for axial and rockin motion thereon, connections between said ho der and chasers for holding said chasers in closed positions when positioned therein in one posi tion of said holder relative to said body, means yieldable to torque produced by operation of said chasers on the work tending to hold said holder in the angular relation of said holding position, and means for preventing release of said chasers until said holder is moved axially of said body to a predetermined position and for preventing said axial movement until a predetermined extent of rocking has been reduced by such torque.

14. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, a cam member movable axially of said body and having operative connections to said chasers for moving said chascrs between said posi ions on axial movement of said cam member, said cam member having latch portions, a locking member rockably mounted and having latch portions positioned to hold said cam member in chaser closed position in one rocked postion thereof by cooperative overlapping of the respective latch portions, and means responsive to torque between the work and chasers acting under predetermined conditions to rock said locking member to remove said latch portions from overlapping relation to thereby permit said cam member to be moved to chaser open position.

15. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, a cam member movable axially of said body and having operative connections to said chasers for moving said chasers between said positions on axial movement of said cam member, said cam member having latch portions, a locking member rockably mounted and having latch portions positioned to hold said cam member in chaser closed position in one rocked position thereof by cooperative overlapping of the respective latch portions, means responsive to torque between the Work and chascrs acting under predetermined conditions to rock said locking member to remove said latch portions from overlapping relation to thereby permit said cam member to be moved to chaser open position, and means for moving said cam member to chaser open position after said locking member has been rocked to released position.

16. A mechanism of the class described comprising a body, cliasers carried by said body and movable between closed operative positions and open inoperative ositions, a cam member movable axially 0? said body and having operative connections to said chasers for moving said chasers between said positions on axial movement of said cam member, said cam member having latch portions, a locking member rockably mounted and having latch portions positioned to hold said cam member in chaser closed position in one rocked position thereof by cooperative overlapping of the respective latch portions, a holder for said body rockable relative thereto, means for yieldably holding said holder in one angular position from which it may be removed against the action of said yielding means by torque due to resistance of the work to operation of the chaser-s thereon, and operative connections between said holder and locking member to cause rockin of said holder by said torque to move said member toward released position.

17. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative pomtions and open inoperative positions, acam member movable axially of said body and having operative connections to said chasers for moving said chasers between said positions on axial movement of said cam member, said cam member having latch portions, a locking member rockably mounted and having latch portions positioned to hold said cam member in chaser closed position in one rocked position thereof by cooperative overlapping of the respective latch portions, a holder for said body rockably and axially movable relatively thereto, means for yieldingly holding said holder in one angular and axial position from which angular position it may be removed against the action of said yielding means by torque due to resistance of the work to operation of the chasers thereon, operative connections between said holdor and locking member to cause rocking of said holder by said torque to move said member toward released position, and means for preventing rocking of said holder to camreleased position until said holder has been moved axially to a predetermined extent against the pressure of said yielding means.

18. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, a can] member movable axially of said body and having operative connections to said chasers for moving said Chasers between said positions on axial movement of said cam member, said cam member having latch portions, a locking member rockably mounted and having latch portions positioned to hold said cam member in chaser closed position in one rocked position thereof by cooperative overlapping of the respective latch portions, a holder for said body rockably and axially movable relatively thereto, means for yieldingly holding said holder in one angular and axial position from which angular position it may be removed against the action of said yielding means by torque due to resistance of the work to operation of the chasers thereon. operative connections be tween said holder and locking member to cause rocking of said holder by said torque to move said member toward released position, means for preventing rocking of said holder to cam-released position until said holder has been moved axially to a predetermined extent against the pressure of said yielding means, and means for preventing such axial movement of said holder until after an initial rocking movement of said holder toward chaser releasing position has been effected. 7

19. A mechanism of the class described comprising a body, chasers carried by said body and movable between closed operative positions and open inoperative positions, a cam member movable axially of said body and having operative connections to said chasers for moving said chasers between said positions on axial movement of said cam member, said cam member having latch portions, a locking member rockably mounted and having latch portions positioned to hold said cam member in chaser closed position in one rocked position thereof by cooperative overlapping of the respective latch portions, a holder for said body rockably and axially movable relatively thereto, means for yieldingly holding said holder in one angular and axial position from which angular position it may be removed against the action of said yielding means by torque due to resistance of the work to operation of the chasers thereon, operative connections between said hold or and locking member to cause rocking of said holder by said torque to move said member toward released position, means for preventing rocking of said holder to cam-released position until said holder has been moved axially to a predetermined extent against the pressure of said yielding means. and means for preventing such axial movement of said holder until after an initial rocking movement of said holder toward chaser releasing position has been effected, said operative connections also being eflective to cause axial movement of said holder from said one axial position to a predetermined extent to positively move said cam member toward chaser open position.

In testimony whereof we have ailixed our signatures.

ERNEST 'l. BYSSHE. ROBERT R. FINN.

CERTIFICATE OF CORRECTION.

Patent No. 1,858,390. Granted May 17, 1932, to

ERNEST T. BYSSHE ET AL.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, line 64, claim 13, for "reduced" read produced; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 14th day of June, A. D. 1932.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

